all about turbos
Posted:
Wed Feb 16, 2005 5:45 pm
by jazzlara
http://auto.howstuffworks.com/turbo2.htm
now answer me this someone.
When the air compressor compresses the outside ambient air, it heats up obviously. but how does it heat up enough just from compressing it a few more psi, that an intercooler is needed? it doesnt make sence to me.
Posted:
Wed Feb 16, 2005 6:04 pm
by swimshady906
Typically you dont need an intercooler unless you are goin over 10 psi ... sttock turbo applications even have tiny tiny side mounts.
The air heats up because pressure is positivly related to the temp of the gas.
Posted:
Wed Feb 16, 2005 6:15 pm
by jazzlara
swimshady906 wrote:
The air heats up because pressure is positivly related to the temp of the gas.
right. i just didnt think that only 5-10 psi would heat ambient air up so fast that it needed an additional cooler...
I like the idea of dual turbos!
Posted:
Wed Feb 16, 2005 9:55 pm
by Turbosolara
Remeber, air expands when it is hot, and it contracts when it is cold. cold is always good.
i could also explain it in term of physic. ideal gas law..
PV=NRT.
P is the pressure, v is the volume, N is mole of the gas molecule , T = temperature. so you rearrange the formula and you get
P/NR = VT. so if the molecule size stay the same....the R is a constant number. the pressure is increased in a large amount, and the volume is compressed into same volume (so let's say V is the same). the n (molecule mass) would increase due to comression. you would see pressure has direct relationship with temperature.
here are more reasons that the air heat up because the turbo has two turbines, which one for exhaust and one for intake. Since they are in the same unit, the exhaust side would pass the heat over to the intake side. In turbocharged motor, the engine exhaust temperature are far higher then N/A because of entropy happen. not only that, another reason is that it has more crazy combusion happen in your cylinder chamber, the temperature sure is higher then N/A. Another addtional reason is that turbine are spinning over 10000 rpm to compress the air, the turbo it self would get pretty hot as well.
intercooler is always good for turbocharged motor. i think it is wrong to think that you only need IC when you are boosting high. I think people make a statement like that because it is true that the higher you boost, the more power difference you would see. but that is always your engine and turbo are producing heats.
for example, my exhuast temperature usually is about 700-750 degree when I am not boosting but cruising on at 80mph. When i boost, the temperature can go as high as 800-1000.
Posted:
Thu Feb 17, 2005 10:26 am
by swimshady906
Thats good stuff from Utlraslow .... like engineering physics all over again
But serious ... good information.
Posted:
Fri Feb 18, 2005 7:53 pm
by DatSRBoi
Off topic..Got a Question. If I had an intercooler on my car but no boost of any kind (no S/C nor turbo). Like a long expensive cold air intake you goi from the throttle piped down into the intercooler piped back up into the engin bay away from the ground to advoid water. Will it work? Yeah I know its a waste of money but will it make a differnce?
Posted:
Fri Feb 18, 2005 9:39 pm
by Turbosolara
i have no clue about what are you talking about
Posted:
Fri Feb 18, 2005 10:45 pm
by DatSRBoi
Sorry got too hyper and typed it fast. Umm its like and injen intake with cold air extension. But instead of having the filter go on the end it is piped to the intercooler and from the intercooler piped up into the engin bay on the other side. That way its a cold air intake and advoids sucking in water....And it looks cool. My question is will it really work? Yes I know thats waste of money...Just wondering.
Posted:
Sat Feb 19, 2005 10:42 pm
by Turbosolara
It is waste of money because it doesnt make that much difference since the air your car is sucking is already kinda cold. Also, a over extended intake might cause your intake could not get the enough air since the air breathing process has longer path which require more force and time to suck it into maniford. you might try to custom made some pipe with this
http://cgi.ebay.com/ebaymotors/ws/eBayI ... ename=WDVW
but i still doubt how would it help.
Posted:
Sun Feb 20, 2005 10:14 am
by jazzlara
Thanks ultraslow. you lost me with the math...lol...(im left handed, I dont know math) but great info.
I never thought of the transfer of heat from turbine to turbine.